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| 核心单元切削新型防屈曲支撑的理论研究及数值分析 |
| Theoretical Study and Numerical Analysis of a new Buckling Restrained Brace for Core Unit Cutting |
| 投稿时间：2025-04-05 修订日期：2025-04-24 |
| DOI： |
| 中文关键词: 多阶段屈服 防屈曲支撑 加劲肋端部应力 力学性能 滞回性能 有限元分析 |
| 英文关键词:multi-stage yielding buckling restrained brace stress at the end of the stiffening rib mechanical property hysteresis performance finite element analysis |
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| 中文摘要: |
| 为了有效减小普通一字形防屈曲支撑(Ordinary zigzag buckling restrained brace,OZBRB)加劲肋端部的应力,让支撑能更充分发挥其耗能能力,以及让支撑在多遇地震作用下开始屈服耗能,以适应不同水平的地震作用,对支撑核心单元进行两种不同程度的切削,设计了一种核心单元切削新型防屈曲支撑(Core unit cutting new buckling restrained brace,CCBRB),介绍了其构造与特点,推导了CCBRB的等效刚度、屈服力和屈服位移的理论计算公式,建立其理论模型,并设计三组共四个模型,利用ABAQUS软件建模,研究三组模型在单向轴压荷载下的力学性能、单周往复荷载下耗能性能以及加劲肋端部应力的差异,分析CCBRB的构造合理性,并验证理论公式的可靠性。结果表明:推导的理论公式有较高精度；CCBRB具有更小的屈服位移,单压作用下的荷载-位移曲线与骨架曲线均呈现明显的多段折线形式；CCBRB的滞回曲线饱满,具有良好的耗能性能；CCBRB的加劲肋端部应力相比分组的OZBRB有明显的降低,对加劲肋端部的应力起到了较好的改善作用。 |
| 英文摘要: |
| In order to effectively reduce the stress at the end of the stiffening ribs of the ordinary zigzag buckling restrained brace(OZBRB), so that the braces can give full play to their energy dissipation capacity, as well as to allow the braces to begin to yield and dissipate energy under multiple seismic events, so as to adapt to different levels of seismic effects. Two different degrees of cutting of the core unit of the support were carried out, and a core unit cutting new buckling restrained brace(CCBRB)was designed, its structure and characteristics are introduced, theoretical formulas for equivalent stiffness, yield force and yield displacement of CCBRB are derived, its theoretical model is established, and three groups of four models were designed, ABAQUS software was used to model the mechanical properties of the three groups of models under unidirectional axial compressive loading, the energy dissipation properties under uni-weekly reciprocating loading and the differences in the stresses at the ends of the stiffening ribs, and to analyse the constructive rationality of the CCBRB, and verify the reliability of the theoretical formula. The results show that: the theoretical formulae derived have higher accuracy; CCBRB has smaller yield displacement, and the load-displacement curves and skeleton curves under single compression show obvious multi-segment folding forms; CCBRB has a full hysteresis curve with good energy dissipation properties; The stress at the end of the stiffening rib of CCBRB is significantly reduced compared to the grouped OZBRB, which provides a better improvement of the stress at the end of the stiffening rib. |
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